CA2097202A1 - Conduit Valve Providing Wide Neutral in a Hydrostatic Transmission - Google Patents

Conduit Valve Providing Wide Neutral in a Hydrostatic Transmission

Info

Publication number
CA2097202A1
CA2097202A1 CA2097202A CA2097202A CA2097202A1 CA 2097202 A1 CA2097202 A1 CA 2097202A1 CA 2097202 A CA2097202 A CA 2097202A CA 2097202 A CA2097202 A CA 2097202A CA 2097202 A1 CA2097202 A1 CA 2097202A1
Authority
CA
Canada
Prior art keywords
fluid system
neutral
displacement
valve mechanism
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2097202A
Other languages
French (fr)
Other versions
CA2097202C (en
Inventor
Dale I. Havens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tecumseh Products Co
Original Assignee
Tecumseh Products Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tecumseh Products Co filed Critical Tecumseh Products Co
Publication of CA2097202A1 publication Critical patent/CA2097202A1/en
Application granted granted Critical
Publication of CA2097202C publication Critical patent/CA2097202C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/4043—Control of a bypass valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing
    • B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing of fluid gearing
    • B60K17/105—Units comprising at least a part of the gearing and a torque-transmitting axle, e.g. transaxles

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Control Of Fluid Gearings (AREA)

Abstract

A valve mechanism for a hydrostatic transmission having a variable displacement pump and a motor in fluid communication with each other via a closed-loop fluid system. The valve mechanism provides pressure relief and a wide neutral feature within a predetermined range of movement about a zero displacement or neutral position of the pump. The valve mechanism is variably controlled by and in coordination with the movement of the displacement pump control mechanism from a fully open position through a fully closed position, such that as the pump is shifted into and out of neutral from both a forward and reverse displacement position, the valve mechanism is moved therewith. The valve mechanism constitutes a ring surrounding the conduit and is responsive to the pump control mechanism so as to move concentrically therewith.
The ring valve includes bores selectively communicating with respective bores in the fluid system such that the fluid system is in selective communication with a cavity formed in the housing.
The bores provide a metered leak path from the fluid system within 3° of neutral in either the forward or reverse displacement positions upon actuation of the pump control mechanism into the same displacement position so as to reduce the pressure within the fluid system during engagement of the transmission. Movement beyond 3°
completely closes the valve such that full pressure may be developed within the fluid system.
CA002097202A 1992-09-28 1993-05-28 Conduit valve providing wide neutral in a hydrostatic transmission Expired - Fee Related CA2097202C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/952,670 1992-09-28
US07/952,670 US5235810A (en) 1992-09-28 1992-09-28 Conduit valve providing wide neutral in a hydrostatic transmission

Publications (2)

Publication Number Publication Date
CA2097202A1 true CA2097202A1 (en) 1994-03-29
CA2097202C CA2097202C (en) 1996-12-03

Family

ID=25493125

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002097202A Expired - Fee Related CA2097202C (en) 1992-09-28 1993-05-28 Conduit valve providing wide neutral in a hydrostatic transmission

Country Status (2)

Country Link
US (1) US5235810A (en)
CA (1) CA2097202C (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6349544B1 (en) 1996-06-26 2002-02-26 Kanzaki Kokyukoki Mfg. Co., Ltd. Mechanism of returning to neutral for axle driving apparatus
US6513325B2 (en) 1996-06-26 2003-02-04 Kanzaki Kokyukoki Mfg. Co., Ltd. Mechanism of returning to neutral for axle driving apparatus
US6341488B1 (en) 1996-06-26 2002-01-29 Kanzaki Kokyukoki Mfg. Co., Ltd. Mechanism of returning to neutral for axle driving apparatus
US6109032A (en) * 1996-06-26 2000-08-29 Kanzaki Kokyukoki Mfg. Co., Ltd. Mechanism of returning to neutral for axle driving apparatus
US6571554B2 (en) * 2001-04-25 2003-06-03 Tecumseh Products Company Hydrostatic transmission having hydraulic dampening and neutral bleed mechanism
US6739128B2 (en) * 2001-05-24 2004-05-25 Tecumseh Products Company Electronically controlled dampener for hydrostatic transmission
JP4105557B2 (en) * 2003-01-30 2008-06-25 株式会社 神崎高級工機製作所 Hydraulic continuously variable transmission
US7133758B2 (en) * 2004-10-21 2006-11-07 Cnh America Llc Neutral start interlock
US20080026899A1 (en) * 2006-07-28 2008-01-31 Robert Carlson Drive train for a tractor
US7739870B2 (en) 2006-08-04 2010-06-22 Briggs And Stratton Corporation Hydrostatic transmission
US7614227B2 (en) 2006-08-04 2009-11-10 Briggs And Stratton Corporation Rotary control valve for a hydrostatic transmission

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1726481A (en) * 1925-08-03 1929-08-27 Oilgear Co Hydraulic transmission
GB994692A (en) * 1961-06-12 1965-06-10 Dowty Hydraulic Units Ltd Improved positive displacement pump
US3165069A (en) * 1961-07-27 1965-01-12 Jaromir Tobias Hydraulic pressure automatic propulsion system
US3171255A (en) * 1962-04-17 1965-03-02 John A Lauck Hydrostatic transmission
US3171256A (en) * 1963-01-03 1965-03-02 John A Lauck Hydrostatic transmission
US3451218A (en) * 1967-09-01 1969-06-24 Towmotor Corp Compensator valve for hydrostatic transmission
US3609973A (en) * 1968-09-14 1971-10-05 Kubota Ltd Hydraulically driven variable speed power transmission assembly
DE1951234B2 (en) * 1969-10-10 1974-07-11 Linde Ag, 6200 Wiesbaden Axial piston machine for a hydrostatic remote transmission
US4211079A (en) * 1979-04-27 1980-07-08 Deere & Company Positive neutral control for hydrostatic transmission
JPS61153057A (en) * 1984-12-26 1986-07-11 Honda Motor Co Ltd Hydrostatic continuously variable transmission
JPS63149469A (en) * 1986-12-12 1988-06-22 Honda Motor Co Ltd Distribution ring of hydraulic continuously variable transmission
US4856264A (en) * 1987-01-26 1989-08-15 Honda Giken Kogyo Kabushiki Kaisha Hydraulic transmission apparatus
JPS6435168A (en) * 1987-07-31 1989-02-06 Honda Motor Co Ltd Control device for vehicle continuously variable transmission
JP2677580B2 (en) * 1988-02-03 1997-11-17 株式会社神崎高級工機製作所 Axle drive
US4899541A (en) * 1988-03-01 1990-02-13 Kanzaki Kokyukoki Mfg. Co. Ltd. Axle driving apparatus
JPH01238761A (en) * 1988-03-18 1989-09-22 Yamaha Motor Co Ltd Shift device for lawn mower or the like
DE3812300C1 (en) * 1988-04-13 1989-03-02 Hydromatik Gmbh, 7915 Elchingen, De
US4907408A (en) * 1988-04-22 1990-03-13 Allied-Signal Inc. Variable displacement hydraulic servomotor system
US5010733A (en) * 1989-03-24 1991-04-30 Sauer-Sundstrand Inc. Hydrostatic transmission with hydraulic bypass and air bleed
JPH0747232Y2 (en) * 1989-07-12 1995-11-01 株式会社神崎高級工機製作所 HST type axle drive
CA2022176C (en) * 1989-07-28 1995-01-03 Sadanori Nishimura Hydraulic transmission for motor vehicle
US4968227A (en) * 1989-12-11 1990-11-06 Eaton Corporation Variable displacement fluid pump with improved wideband neutral

Also Published As

Publication number Publication date
US5235810A (en) 1993-08-17
CA2097202C (en) 1996-12-03

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20090528